Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3173b70ee254fa8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 18:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d4b86ef4bf121aec43e18bbb515f8be SHA-1: 8d82620f216cbbd908dbbf23c799bc40f6163f93 SHA-256: b3173b70ee254fa8f0295799a81ea1036a8762188fbabb3f8b0ca3233b9b832e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URLs pointing to potentially compromised websites. The document body is heavily obfuscated, suggesting an attempt to hide its true nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ilovegabal.net/fckeditor/_upload/file/gubifusamufakanemize.pdf In PDF document text
    • https://mosallaesf.ir/uploads/ck/files/kidarupirifamiludij.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/sagisitojexagituw.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/22280246512.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ia4flppo78rj960246uett56ik/75967927157.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/lilodemuv.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3f87c54bd0c0650c7697ac50d40fc06c/taxexubebexe.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/jelalowuzaza.pdfIn PDF document text
    • https://efnnma.org/files/file/zelepetufunara.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ef69bb60---pabed.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sutezida.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fc336a8530a0c0a3e4eabebfcc999478/bowowajad.pdfIn PDF document text
    • http://isvpro.com/custom/files/30499938039.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/nuwujupibunixusulo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/xakojofu.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/runixewo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dttapmm28rfbskkltn5veujbq4/wigagiwatuvijubifaku.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607486cf0f057---durapubawubasasadibatat.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/92137142002.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/terufudefazizuxagubo.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/8086768299.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-28/20210828045604351919.pdfIn PDF document text
    • https://andrejc.si/files/file/16272667235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dell+latitude+e6430+keyboard+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 11228 bytes
SHA-256: 51d1dc10a83c59e8f20cff90eae17f15176e745009c409ba7c0e20fba0870e3a
font_01_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 17960 bytes
SHA-256: f8c65ffead7b435dee13d76911eaeb8d67607d491b51659fbf8e1102ab0a6073

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